Adding basic files Adding basic files including meson build file, service files, git config, clang-format and clang-tidy Tested: Buildable and service can up as expected. ``` bmc:~# busctl tree com.google.gbmc.boot_time_monitor Only root object discovered. ``` Google-Bug-Id: 298918774 Change-Id: Ia88b00aa9bae1a4d04d5ec2a8dbe52f8c8bf8d2c Signed-off-by: Michael Shen <gpgpgp@google.com>